﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Text;
using System.Data;
using System.Web.Script.Serialization;

namespace TaoBaoProject.Common
{
  public class JsonOps
  {
    #region dataTable转换成Json格式
    /// <summary>  
    /// dataTable转换成Json格式  
    /// </summary>  
    /// <param name="dt"></param>  
    /// <returns></returns>  
    public static string DataTable2Json(DataTable dt)
    {
      StringBuilder jsonBuilder = new StringBuilder();
      jsonBuilder.Append("{\"");
      jsonBuilder.Append(dt.TableName);
      jsonBuilder.Append("\":[");
      jsonBuilder.Append("[");
      for (int i = 0; i < dt.Rows.Count; i++)
      {
        jsonBuilder.Append("{");
        for (int j = 0; j < dt.Columns.Count; j++)
        {
          jsonBuilder.Append("\"");
          jsonBuilder.Append(dt.Columns[j].ColumnName);
          jsonBuilder.Append("\":\"");
          jsonBuilder.Append(dt.Rows[i][j].ToString());
          jsonBuilder.Append("\",");
        }
        jsonBuilder.Remove(jsonBuilder.Length - 1, 1);
        jsonBuilder.Append("},");
      }
      jsonBuilder.Remove(jsonBuilder.Length - 1, 1);
      jsonBuilder.Append("]");
      jsonBuilder.Append("}");
      return jsonBuilder.ToString();
    }

    #endregion dataTable转换成Json格式
    #region DataSet转换成Json格式
    /// <summary>  
    /// DataSet转换成Json格式  
    /// </summary>  
    /// <param name="ds">DataSet</param> 
    /// <returns></returns>  
    public static string Dataset2Json(DataSet ds)
    {
      StringBuilder json = new StringBuilder();

      foreach (DataTable dt in ds.Tables)
      {
        json.Append("{\"");
        json.Append(dt.TableName);
        json.Append("\":");
        json.Append(DataTable2Json(dt));
        json.Append("}");
      } return json.ToString();
    }
    #endregion

    /// <summary>
    /// Msdn
    /// </summary>
    /// <param name="jsonName"></param>
    /// <param name="dt"></param>
    /// <returns></returns>
    public static string DataTableToJson(string jsonName, DataTable dt)
    {
      StringBuilder Json = new StringBuilder();
      Json.Append("{\"" + jsonName + "\":[");
      if (dt.Rows.Count > 0)
      {
        for (int i = 0; i < dt.Rows.Count; i++)
        {
          Json.Append("{");
          for (int j = 0; j < dt.Columns.Count; j++)
          {
            Json.Append("\"" + dt.Columns[j].ColumnName.ToString() + "\":\"" + dt.Rows[i][j].ToString() + "\"");
            if (j < dt.Columns.Count - 1)
            {
              Json.Append(",");
            }
          }
          Json.Append("}");
          if (i < dt.Rows.Count - 1)
          {
            Json.Append(",");
          }
        }
      }
      Json.Append("]}");
      return Json.ToString();
    }

    /// <summary>
    /// 将datatable转换为json  
    /// </summary>
    /// <param name="dtb">Dt</param>
    /// <returns>JSON字符串</returns>
    public static string Dtb2Json(DataTable dtb)
    {
      JavaScriptSerializer jss = new JavaScriptSerializer();
      System.Collections.ArrayList dic = new System.Collections.ArrayList();
      foreach (DataRow dr in dtb.Rows)
      {
        System.Collections.Generic.Dictionary<string, object> drow = new System.Collections.Generic.Dictionary<string, object>();
        foreach (DataColumn dc in dtb.Columns)
        {
          drow.Add(dc.ColumnName, dr[dc.ColumnName]);
        }
        dic.Add(drow);

      }
      //序列化  
      return jss.Serialize(dic);
    }
  }
}